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I guess the question is kind of vague, but let’s use the Iraq war as an example. When the war started, were Air Force Generals the only ones picking targets and deciding what to hit them with, or do Colonels or Majors get involved as well?
Same with the Army, I assume the Generals say “OK, let’s roll toward Baghdad,” but as far as deciding what units to use, when, and how, is that still the work of Generals?
Are Admirals the only deciders as to where certain boats are going to be, and what they are supposed to be doing, or do Captains get involved?
Bonus question: How are decisions made across branches of the service? For example, who decides if they should send a SEAL squad or some Airborne Rangers to do a certain job?
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It really depends on many factors, such as the nature of the conflict. In an insurgency or colonial warfare ,officers such as garrison commanders, at levels of Cols or Brigadiers will be making decisions which have a strategic impact. For example which ones of the militias to go after who to be buddy buddy with. A report in the Times Magazine reported the experiences of a Major in Iraq who would decide which militant group he would support and who he would go after.
On the other hand in a conventional large state vs state conflict, even field army commanders may have a mostly tactical viewpoint. So in the ETO only Eisenhower, Monty, Bradley and some other officers really only had to worry about the strategic direction and related affairs, everyone else could ignore them, unless they directly affected them. So Hodges, Patton, Dempsey, Simpson etc, were not involved directly in strategic decision making, though they undoubtedly gave their input, well we all know Patton did. Indeed this is one of the reasons why Patton never advanced beyond army commander, and why first Bradley and then Devers were promoted over his head to Army Group command, since the brass felt that he was bereft of strategic thought.
In addition staff officers (who are obviously of a lower rank) will be highly involved in strategic decisions, and their implementation. So a Chief of Staff of say an Army Group will have a lot more influence.